Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 131,364	$ 49,189	$ 290,102	$ 108,601
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	105,615	39,574	229,892	84,844
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 25,749	$ 9,615	$ 60,210	$ 23,757